They are confused. They are saying that the reverse DNS of your IP resolves to a "dialup or DSL network" -- but they almost certainly can't know that.
Of course, they can. Stop the FUD and lies when your bogus ideology isn't adhered to.
What they really mean is that your reverse DNS entry looks similar to those that dynamic IPs have (with a bunch of numbers in there)
that's one way, but by far not the only way.
Fortunately, decent anti-spam software won't block your mail, so this is a non-issue for most people.
MXs getting bombed from infected PCs on subscriber access network is HUGE issue for every MX on the planet, 30% - 40% of all abuse traffic is from these networks, 99+% of traffic from these networks is abuse. Probably over 90% of all infected mail is from these networks. So MXs blocking these networks is a HUGE issue, HUGEly effective, and is the entire impetus behind:
1. network operators blocking egress from their subscriber access networks to port 25.
2. the extremely successful greylisting policy (4xx reject once all never-seen ip/from/to triplet. www.greylisting.org
To get around it for an individual mailserver, you can either route the E-mail through your Internet provider's mailserver in your mail client
.. a tactic you absolutely refused to do, even through another of your own in-house MTAs, for declude mailserver when it was on a charter subscriber PTR.
I'm guessing which IP is generating the complaint, but this one is OK:
mx86# dig -x 65.81.91.11
; <<>> DiG 9.2.3 <<>> -x 65.81.91.11 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18889 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3
;; QUESTION SECTION: ;11.91.81.65.in-addr.arpa. IN PTR
;; ANSWER SECTION: 11.91.81.65.in-addr.arpa. 43200 IN PTR mail.robinsonmfg.com.
Len
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